package com.hmdp.utils;

import cn.hutool.core.bean.BeanUtil;
import com.hmdp.dto.UserDTO;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.web.servlet.HandlerInterceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.Map;
import java.util.concurrent.TimeUnit;

import static com.hmdp.utils.RedisConstants.LOGIN_USER_KEY;
import static com.hmdp.utils.RedisConstants.LOGIN_USER_TTL;

/**
 * 让拦截器生效需要配置
 */
public class RefreshTokenInterceptor implements HandlerInterceptor {



    private StringRedisTemplate stringRedisTemplate;

    //因为这个拦截器是自己建的，spring容器不会帮我们注入，谁用这个拦截器，谁把redistmeple传过来
    public RefreshTokenInterceptor(StringRedisTemplate stringRedisTemplate){
        this.stringRedisTemplate=stringRedisTemplate;
    }

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {


        //1.获取请求头中的token
        String token = request.getHeader("authorization");
        if(token==null || token==""){
            //不存在需要刷新的token,放行
            return true;
        }
        //2.基于token获取redis中的用户
        String tokenKey = LOGIN_USER_KEY + token;
        Map<Object, Object> userMap = stringRedisTemplate.opsForHash().entries(tokenKey);
        //3.判断用户是否存在
        if(userMap.isEmpty()){

            return true;
        }
        //5.将查询到的HashMap转变成UserDTO
        UserDTO userDTO = BeanUtil.fillBeanWithMap(userMap, new UserDTO(), false);
        //6.存在，保存用户信息到ThreadLocal
        UserHolder.saveUser(userDTO);
        //7.刷新token有效期
        stringRedisTemplate.expire(tokenKey, LOGIN_USER_TTL, TimeUnit.SECONDS);
        //7.放行
        return true;
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
       UserHolder.removeUser();
    }
}
